speaker noises

Hey, New to the forum, do my own mechanical work but audio not my forte. I have a couple of issues...quite beyond me, both of them: 1. I just installed new 4 way Sony Explod 6 X 9 rear speakers in my 70 Chevelle SS. 2. I have a 6 month old Pioneer DEH-6400BT 22 watt RMS X 4 CD radio unit...